After a stressful illness, a young man notices that he is losing random patches of hair from sharply defined regions of his scalp. This condition, which is often self-limiting, is known as:

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Loss of scalp hair (alopecia) is a common medical condition. When hair loss is patchy, it is called alopecia areata. Alopecia capitis totalis (total loss of scalp hair) is a common complication of the administration of some forms of chemotherapy, which destroy rapidly dividing cancer cells, as well as the rapidly dividing cells in hair follicles. Male pattern baldness typically affects the vertex of the scalp.

After a Stressful Illness, a Young Man Notices That He